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Table 4-3 Analytical Results of Groundwater Samples Co at ARCO Station 2093,Tracy,Cahforrua i <br /> Aromatic volatile organics(BETX),ppb TPH,ppm <br /> Sample Date Ethyl- 1 1 1,2- <br /> Number sampled Benzene benzene Toluene X leve TpH Gasoline Dieseel Motor oil Total ichloroethane <br /> range lead m b <br /> DHS ` <br /> levels <br /> (a) 1 (a) 680(a) 100(b) I750(a) (c) (c) (c) (c) (d) 0 5{a) <br /> ATR-10 10/16/90 <O.5 <0.5 <0.5 <0.5 <0 05 <0 05 <0 05 <0 O5 <br /> <05 <br /> ATR-12 1 10/16/90 <0 5 <05 <05 <05 <095__]__ <0 05 <0 05 <0 05 <br /> <05 <br /> (a)Department of Health Services(DHS)Maximum Contaminant Level(MCL) <br /> (b)DHS Dnnhng Water Action Level(no MCL established) <br /> (c)No MCL or Action Level Established <br /> (d)DHS primary dnnlung water standard(MCL)for lead,0 05 mdhgrams)hter <br /> (e)Hydrocarbons were not charactenzed However,the hydrocarbons are within the low boiling point(C4-C12)range which may <br /> mdicam the presence of gasolne <br /> I <br /> I I <br />